/ Dictionary / Index W western diamondback rattlesnake: Meaning and Definition of Find definitions for: west'ern dia'mondback rat'tlesnake Pronunciation: [key] an extremely venomous diamondback rattlesnake, Crotalus atrox, of the southwestern U.S. and Mexico. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Western Church Western Empire Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language